<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		div:first-child {
			height: 100px;
			width: 100px;
			background-color: blue;
			/*display: none;
			visibility: visible;
			visibility: hidden;*/
		}

		div:last-child {
			height: 100px;
			width: 100px;
			background-color: red;
		}
	</style>
</head>
<body>
	<div></div>
	<div></div>
</body>
</html>